Method of assembling core structures for dynamo-electric machines.



v G. M. EATON. METHOD OF ASSEMBLIN-G CORE STRUCTURES FOR DYNAMO ELECTRIC MACHINES.-

APPLICATION 111.50 JAN. 1. 1911 Patenfed Nov. 2, 1915.

Q2; lgm og ATTORNEY WITNESSES:

UNITED STATES PATENT OFFICE.

GEORGE M; EATON, 0F WILKINSBURG, PENNSYLVANIA, ASSIGNOR 'IO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

METHOD OF ASSEMBLING CORE STRUCTURES FOR DYNAMO-ELECTRIC MACHINES.

Application filed January 7, 1911.

To all whom, it may concern:

Be it known that I, (lnonon M. EATON, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Methods of Assembling Core Structures for Dynamolllectric Machines, of which the following is a specification. (Y i My invention relates to electrical apparatus and it has special reference to the laminated core members of dynamo-electric machines. i

The object of my invention is to provide a method of so assembling the laminae of a core structure as to insure a very close fit between the laminae and the key which fastens them in position.

The laminae of which the core structure of dynamo-electric machines are composed. are usually notched to engage a key with which the frame or spider of the machine is provided for determining their relative positi ons.

In order to facilitate the assembling op- .eration, the laminae notches have heretofore been ,made suiiiciently large to fit thekey loosely and, since some irregularity exists in the assembled structure which necessi tates the filing of the core slots before the winding can be placed in position, the

laminae of the completed structure are liable v to accidental displacement.

According to my present inventioml enlarge the bottom of the notch in each lamina and cut the sides of the notch either to fit the key very closely and accurately orto a size very slightly narrower than the key.

I! the notches are slightly narrower than the key, the sides of each notch are bent out of the plane of the lamina by the key in asspmhiing the core structure; In order to facilitate the assemblingprocess, the sides oi each notch may be oii'set in the punching process and, in either case, aftertl'ie laminae are assembled, I apply suiiicient pressure along the sides of the key to straighten the bent sides of the notches, thereby causing them to lirlnly grip the key. Not only are the positions of the laminae accurately fixed,

Specification of Letters Patent;

PatentedN0v.2,1915,

Serial No. 601,319.

but the possibility of accidental displace; ment of any or all of them is avoided.

Figure 1 of the accompanying drawings railway motor armature or other dynamoelectric machine is mounted on a shaft 2 and is held in position by a key 3. On the spider is mounted a core structure 4 composed of a plurality of plates or laminae of magnetizahle material each of which is provided with a notch 5 which engages a key 6.

The bottom of the notch 5 is enlarged slightly, as shown in Fig. 1 of the drawings, and the sides 7 of the notch are bent slightly out of the plane of the laminae during the punching process, as shown in F ig. 2 of the drawings.

By this means, the laminae may be easily assembled on the spider 1, and, at the same time, the notches may be so proportioned as to fit the keyj6 very closely when the portions. 7 are flattened out in the filial step of the assembling process, as shown. in Fig. 3

of the drawings. a i

As above indicated, the sides of th notches may be bent in the assembling instead of inthe punching process, if desired. My Invention 18, of course, not restricted to the rotating parts of dynamo-electric mastructure which consists in assembling laminae having corresponding notches upon a supporting member provided with e notchengaging key or projection of greater thickness than the normal Width of the notches, and then compressing the assembled lamina: to cause the side Walls of the notches to grip the sides of the key or projection.

I In testimony whereof, I have hereunto ubscribed my name this 29th day of Dec. 10 1910.

GEORGE M. EATON.

Witnesses G. H. F. 110m, B. B. Hixns. 

